Optical diagnosis of plasma waves via the ion dielectric response
Laser induced fluorescence (LIF) has been demonstrated to be a sensitive non-perturbative diagnostic of ion kinetics. An experimental investigation using LIF is described into electrostatic waves near the ion cyclotron frequency, namely the electrostatic ion cyclotron (IEC) wave and the neutralized ion Bernstein (NIB) wave. Through the use of phase-lock techniques, or local measurements of the ion distribution synchronous with the wave field, a component of the perturbed distribution is observed that oscillates coherently with the wave. Three methods are described, all of which are subject to the limitation of diagnosis of waves with frequency less than or about the plasma frequency and with wavelength greater than the diagnosed plasma volume defined by the intersection of the laser beam and the focal image of the fluorescence detection optics. Results and conclusions from all three investigations are given. A test of the linear Ulasov theory predictions shows good agreement between theory and experiment.
Bibliographic Reference: Paper presented: International Workshop on "Nonlinear Phenomena in Vlasov Plasmas" Cargese, Corsica (FR), July 11-16, 1988
Availability: Available from (1) as Paper EN 34389 ORA
Record Number: 198910393 / Last updated on: 1994-12-01
Original language: en
Available languages: en